People with complex regional pain syndrome (CRPS), what used to be called reflex sympathetic dystrophy (RDS) can find it hard to explain to people what it is. That is, if they understand it themselves.
The National Osteoporosis Society in the United Kingdom has made available this leaflet that explains
what the condition is, why it has differing names, how it is diagnosed
and how it may be treated. It also refers to a number of patient
organisations and useful websites.
The document is in PDF format: Patient information leaflet.
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If  you have a chronic illness or are living with chronic pain, chances are you get a little tired of trying to explain your situation all the time. The Reflex Dystrophy Syndrome Association has made available some very interesting and helpful brochures, cards, and hand outs that people can use to help spread the word about complex regional pain syndrome (CRPS), formerly known as reflex dystrophy syndrome (RDS):

“I Have CRPS” HandiCard
Pediatric CRPS Tri-Fold Brochure
Helping Children/Youth With CRPS Succeed in School
“Telltale Signs of CRPS” HandiCard

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